Kitty: a wonderful early computer animation from Russia (1968)

From Etudes.ru (Google translation):

More than 40 years ago in 1968 ... A team led by Nikolai Nikolaevich Konstantinov creates a mathematical model of the motion of the animal (cat). The BESM-4 machine, executing a written program for solving ordinary (in the mathematical sense of the word) differential equations, draws a cartoon "Kitty" containing even by modern standards an amazing animation of cat movements created by a computer.

(via r/ObscureMedia)